how to solve this equation

I'm trying to solve this equation:

c=(sind(d)*sind(L)*cosd(b)) - (sind(d)*cosd(L)*sind(b))+(cosd(d)*cosd(L)*cosd(b)*cosd(h))+(cosd(d)*sind(L)*sind(b)*cosd(h))==0

solve for h, L=b=28.6

but I'm getting error:

??? Error using ==> cosd at 16
Argument should be real.

I'm using MATLAB 2010a

Answer 1

[Romil Shah]

%Using any value gives a proper answer...please try again

L=28.6;
b=28.6;
d=28.6;
h=28.6

c=(sind(d)*sind(L)*cosd(b)) - (sind(d)*cosd(L)*sind(b))+(cosd(d)*cosd(L)*cosd(b)*cosd(h))+(cosd(d)*sind(L)*sind(b)*cosd(h));

c =

      0.7709

[Kanav Vij]

I want to find the value of h for c=0

Answer 2

[Walter Roberson]

In order for that to have happened, your "d" would have had to have been a complex number. For example if you had used

d = i;

then the problem could have occurred, as "i" is the imaginary unit, sqrt(-1). So is "j".